What is an example of solitary play in young children?

Solitary play is characterized by a child engaging in play independently, without involving others. In this context, building blocks alone perfectly illustrates solitary play, as it involves a child focusing on their own activities and creativity without interaction or collaboration with peers. This type of play is essential for children as it allows them to develop individual skills, explore their interests, and use their imagination in a self-directed manner.

The other examples involve interaction or cooperation with others, which do not align with the concept of solitary play. Playing on the swing with a friend, riding tricycles in a group, and participating in team sports all emphasize social engagement and collaboration, distinguishing them from solitary activities. Thus, the correct answer highlights an important aspect of child development through independent play.